Flexible conduit.



G. W. EMRICK.

FLEXIBLE CONDUIT.

APPLICATION FILED FEB. 28. 191

Patented Nov. 12, 1918.

UNIT

an arts GEORGE W. EMBICK, OF BROOKLYN, NEW YORK, ASSIGNOR TO EASTERN FLEXIBLE CONDUIT COMPANY, OF BROOKLYN, NEW YORK, A CORPORATION OF NEW YORK.

FLEXIBLE GONDUIT.

Specification of Letters Patent. Patented NOV. 12, 1918.

Application filed February 28, 1917. Serial No. 151,430.

To all whom it may concern:

Be it known that I, GEORGE- W. EMRICK, a citizen of the United States of America, and a resident of Brooklyn, Kings county, and State of New York, have invented certain new and useful Improvements in Flexible Conduits, of which the following is a specification, reference being had to the accompanying drawing, forming a partthereof.

My invention relates to improvements in flexible conduits for electrical conductors, and its object is to provide a conduit of simple and inexpensive construction which is strong and durable and which has advantages over such conduits as have heretofore been known.

In order that my invention may be thoroughly understood I will now proceed to describe the same in the following specification, and then point out the novelfeatures thereof in appended claims.

Referring to the drawings:

Figure 1 is an elevation partly in section, of a conduitmade according to and embodying my invention.

Fig. 2 is a transverse section of the conduit shown in Fig. 1, the section being taken on the line 2-2 of Fig. 1.

Fig. 3 is an elevation of a conduit such as of the conduit, flattened and with another part thereof covered by interwoven twine applied thereto in the mannerwhich I have invented.

Fig. 4 is an elevation of a modified form of my invention, this modification showing interwoven twine of unlike materials.

Like characters of reference designate corresponding parts in all the figures.

1O designates a tube which forms the inside of my improved conduit. This is preferably constructed of a tape 11 made of lonitudinal warps 12 of paper twine or the like with interwoven woofs 13 of similar material, and additional reinforcing warps 12 of jute or flax or other material having high tensile strength. An outer cover 14 of thin paper is secured to one side of this tape by some suitable adhesive. This tape is rolled transversely into a tube 10 of circular crosssection with its edges abutting and with its and another pluralityof similar helices 30,

31, 32, 33 in a left hand direction. These helices are so wound that each right hand helix passes over one of the left hand helices as at 24, under the next one as at 25, over the next and so on, the result being that in adj acent crossings of the twines they are alternately over and under one another in the direction of any of the helices (not necessarily adjacent crossings in either a.longitudinal or a transverse direction).

After the tube 10 has been wound by the interlaced twines it is coated with a suitable water-proofing material 40 in the usual manner.

It is not necessary that the twines which are wound helically around the tube all be of the same material. Some of them may be of paper twine and others of cotton string or that they are of unlike material.

The strip or tape of which the inner tube is formed may have all of the longitudinal warps of jute, flax, or like material having high tensile strength.

I have-described the interlaced windings as at least partly made of paper twine. This a is a suitable material to use when the conduit is made for the specific purpose of covering electrical conductors because, it has sufiicient rigidity to give the conduit the required strength for resisting crushing pressures.

Attention is particularly directed to the fact that the warps of the inner tube are pri- 'marily relied upon to give tensile strength This conduit is especially designed for use with electrical conductors but]; do not intend to limit myself to any specific use; intact, I intend no limitations other than those imposed by the appended claims.

WVhat I claim is:

1. A flexible conduit comprising atube of collapsible material, a plurality of strings wound helically around said tube in opposite directions and alternately crossing over and under one another, some of said strings be= ing of paper twine to provide rigidity against crushing pressures.

2. A flexible conduitcomprisinga tube of collapsible material, a plurality of strings ing of semi flexible material to provide rigidity against crushing pressures.

hA flexible conduit comprising a collapsible tube formed from a flat tape having longitudinal warps, a plurality oi' st'rin'gs of semi-flexible material wound helical'ly around said tube in opposite directions and alternately crossing over and under one another to provide rigidity against crushing pressures.

5. A flexible "conduit comprising a tube 7 formed from a tape of interwoven paper twine having longitudinal warps, a pluralit'y of strings wound heli'eally' around said tube in opposite directions and alternately crossing over and" under one another,

some of said strings being of paper twine- 6'. A flexible conduit comprising a tube formedi'r'om a tape of interwoven paper twine having longitudinal'warps and'a paper covering, a plurality of strings Wound helically around said tube in opposite directions and alternately crossing over and under one another, some of said strings" being of paper twine.

7. A flexible conduit comprising a tube of interwoven twine having. longitudinal rein-- I forcing warps of material of relatively high tensile strength, and a woven covering of semi-flexible material arranged to provide rigidity against crushing pressures and adapted to yield in a longitudinal direction to permit the flexing of the conduit.

8. A flexible conduit comprising a tube of interwoven strands having longitudinal warps of paper twine, longitudinal reinforcing warps of material of relatively high tensile strength interwoven therewith, and a w'ovencovering adapted to yield in a longitudinal direction to permit the flexing of the conduit.

9. A flexible conduit'comprising a collapsible tube formed from flat tape of interwoven strands having longitudinal warps of material of relatively high tensile strength, and a woven covering of semi-flexible material arranged to provide rigidity against crushing pressures and adapted to yield in longitudinal direction to permit the flexing of the conduit.

10. A flexible conduit comprising a collapsible tube formed from flat tape of interwoven strandshaving longitudinal warps-of material-of relatively high tensile strength, and a plurality of strings wound helically around said tube in oppositedirections and alternately across, over and under one another, some of said strings being of paper twine to provide rigidity against crushing pressures.

11. A flexible conduit comprising a tube formed parallel to its axisfrom a flat tape of interwoven paper twine, longitudinal reinforcing warps of material of relatively high tensile strength interwoven with the paper twine, and a woven covering adapted to yield in a longitudinal direction to permit the flexin'gxof the conduit.

12. A flexible conduit comprising a tube 7 formed parallel to its axisfrom' a fla't tape of interwoven paper twine, longitudinal reintorcing warps of material of relatively high tensile strength interwoven with the paper twine, and a plurality of strings wound helically around said tubein opposite directions and alternately across, over andund'erone another, some of said strings being of paper twine.

In witness whereof, I have hereunto set my hand this 27th day of February, 1917. GEORGE W. EMRICK.

Copies of this patent may be obtaind mrnw cents each, by addressing the Commissioner of Patents,

Washington, D. G. 

